<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>

</body>
</html>
<script>
//    var aa  =   0&&1;
//    alert(aa)
//    var bb =  1&&0;
//    alert(bb);
//    var cc =  1&&10;
//    alert(cc);
    console.log(0||1);
    console.log(1||0);
    console.log(1||5);
    console.log(5||1);
var a = 1 && 2 && 3;
console.log(a); //3
var b = 0 && 1 && 2;
console.log(b); // 0
var c = 1 && 0  && 2;
console.log(c);  // 0



</script>